What are the general face shapes listed in the material?

The correct categorization of general face shapes includes oval, round, square, and inverted triangle. The oval face shape is often considered the ideal due to its balanced proportions, while the round face shape is characterized by fullness across the cheeks and a soft jawline. The square face shape is defined by a strong jawline and forehead, providing an angular appearance. The inverted triangle shape, often associated with wider foreheads and narrow chins, indicates a face structure that is broader at the top and tapers down.

By recognizing these specific face shapes, barbers can better understand how to tailor haircuts and styles that complement different facial structures, enhancing their clients' overall appearance. This knowledge is essential for providing services that meet diverse client needs.